Simple built-in to create a mudroom and/or storage anywhere from an entry, to kids room or in a laundry room by adding shelves or a deeper bench for sitting. Put drawers under bench or have the seat lift up to store things.
Built-in bookcase for cookbooks! I just want built in bookcases in every room for books! I'll carry a book from one room to another and have a dedicated shelf for my current read. Although, having dedicated space for cookbooks is smart, too.
This reminds me of my first flat. Classic Victorian house interior with an original fireplace, books in the alcove. However I wasn't stylish enough to have those wonderfully chic grey walls with high white accents.